Tongues are a Sign for the Unbeliever

I was 14 years old. I was praising Jesus in English in the Downs Bible Week. It was the first Downs Bible week and we were 2900 people camping at Plumpton Racecourse beside the South Downs in Sussex, UK. Suddenly as I praised Jesus "Thank you, Jesus! Praise you, Jesus! My tongue started singing fluently in languages I had never spoken before. I was carried away in enraptured joy and if it were not for the fact that it lasted more than 40 years I might have thought it was ecstatic tongues. I have preached in Tongues and seen people confess Jesus as Lord after switching to English. I have experimented with Tongues and seen unbelievers drawn to listen to the gospel. I have praised in Tongues and been told I was praising God in Hebrew. This is a book studying the gift of Tongues. There is an academic introduction to the subject and some references to its place in the early Church. There are also insights into its use in the present time. Tongues are a fascinating ability where a man can speak different languages without knowing what he is saying or which language he is speaking. In this book is a message in Tongues given in 1996 as yet uninterpreted. Do you have the key?